PortAudio: jpa_tools.c Source File

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jpa_tools.c
1 /*
2 * Portable Audio I/O Library
3 * Java Binding for PortAudio
4 *
5 * Based on the Open Source API proposed by Ross Bencina
6 * Copyright (c) 2008 Ross Bencina
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining
9 * a copy of this software and associated documentation files
10 * (the "Software"), to deal in the Software without restriction,
11 * including without limitation the rights to use, copy, modify, merge,
12 * publish, distribute, sublicense, and/or sell copies of the Software,
13 * and to permit persons to whom the Software is furnished to do so,
14 * subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
22 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
24 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 /*
29 * The text above constitutes the entire PortAudio license; however,
30 * the PortAudio community also makes the following non-binding requests:
31 *
32 * Any person wishing to distribute modifications to the Software is
33 * requested to send the modifications to the original developer so that
34 * they can be incorporated into the canonical version. It is also
35 * requested that these non-binding requests be included along with the
36 * license above.
37 */
38
39 #include "com_portaudio_PortAudio.h"
40 #include "portaudio.h"
41 #include "jpa_tools.h"
42
43 jint jpa_GetIntField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName )
44 {
45 /* Look for the instance field maxInputChannels in cls */
46 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "I");
47 if (fid == NULL)
48 {
49 jpa_ThrowError( env, "Cannot find integer JNI field." );
50 return 0;
51 }
52 else
53 {
54 return (*env)->GetIntField(env, obj, fid );
55 }
56 }
57
58 void jpa_SetIntField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName, jint value )
59 {
60 /* Look for the instance field maxInputChannels in cls */
61 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "I");
62 if (fid == NULL)
63 {
64 jpa_ThrowError( env, "Cannot find integer JNI field." );
65 }
66 else
67 {
68 (*env)->SetIntField(env, obj, fid, value );
69 }
70 }
71
72 jlong jpa_GetLongField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName )
73 {
74 /* Look for the instance field maxInputChannels in cls */
75 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "J");
76 if (fid == NULL)
77 {
78 jpa_ThrowError( env, "Cannot find long JNI field." );
79 return 0L;
80 }
81 else
82 {
83 return (*env)->GetLongField(env, obj, fid );
84 }
85 }
86
87 void jpa_SetLongField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName, jlong value )
88 {
89 /* Look for the instance field maxInputChannels in cls */
90 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "J");
91 if (fid == NULL)
92 {
93 jpa_ThrowError( env, "Cannot find long JNI field." );
94 }
95 else
96 {
97 (*env)->SetLongField(env, obj, fid, value );
98 }
99 }
100
101
102 void jpa_SetDoubleField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName, jdouble value )
103 {
104 /* Look for the instance field maxInputChannels in cls */
105 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "D");
106 if (fid == NULL)
107 {
108 jpa_ThrowError( env, "Cannot find double JNI field." );
109 }
110 else
111 {
112 (*env)->SetDoubleField(env, obj, fid, value );
113 }
114 }
115
116
117 jdouble jpa_GetDoubleField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName )
118 {
119 /* Look for the instance field maxInputChannels in cls */
120 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "D");
121 if (fid == NULL)
122 {
123 jpa_ThrowError( env, "Cannot find double JNI field." );
124 return 0;
125 }
126 else
127 {
128 return (*env)->GetDoubleField(env, obj, fid );
129 }
130 }
131
132 void jpa_SetStringField( JNIEnv *env, jclass cls, jobject obj, const char *fieldName, const char *value )
133 {
134 /* Look for the instance field maxInputChannels in cls */
135 jfieldID fid = (*env)->GetFieldID(env, cls, fieldName, "Ljava/lang/String;");
136 if (fid == NULL)
137 {
138 jpa_ThrowError( env, "Cannot find String JNI field." );
139 }
140 else
141 {
142 jstring jstr = (*env)->NewStringUTF(env, value);
143 if (jstr == NULL)
144 {
145 jpa_ThrowError( env, "Cannot create new String." );
146 }
147 else
148 {
149 (*env)->SetObjectField(env, obj, fid, jstr );
150 }
151 }
152 }
153
154 PaStreamParameters *jpa_FillStreamParameters( JNIEnv *env, jobject jstreamParam, PaStreamParameters *myParams )
155 {
156 jclass cls;
157
158 if( jstreamParam == NULL ) return NULL; // OK, not an error
159
160 cls = (*env)->GetObjectClass(env, jstreamParam);
161
162 myParams->channelCount = jpa_GetIntField( env, cls, jstreamParam, "channelCount" );
163 myParams->device = jpa_GetIntField( env, cls, jstreamParam, "device" );
164 myParams->sampleFormat = jpa_GetIntField( env, cls, jstreamParam, "sampleFormat" );
165 myParams->suggestedLatency = jpa_GetDoubleField( env, cls, jstreamParam, "suggestedLatency" );
166 myParams->hostApiSpecificStreamInfo = NULL;
167
168 return myParams;
169 }
170
171 // Create an exception that will be thrown when we return from the JNI call.
172 jint jpa_ThrowError( JNIEnv *env, const char *message )
173 {
174 return (*env)->ThrowNew(env, (*env)->FindClass( env, "java/lang/RuntimeException"),
175 message );
176 }
177
178 // Throw an exception on error.
179 jint jpa_CheckError( JNIEnv *env, PaError err )
180 {
181 if( err == -1 )
182 {
183 return jpa_ThrowError( env, "-1, possibly no available default device" );
184 }
185 else if( err < 0 )
186 {
187 if( err == paUnanticipatedHostError )
188 {
189 const PaHostErrorInfo *hostErrorInfo = Pa_GetLastHostErrorInfo();
190 return jpa_ThrowError( env, hostErrorInfo->errorText );
191 }
192 else
193 {
194 return jpa_ThrowError( env, Pa_GetErrorText( err ) );
195 }
196 }
197 else
198 {
199 return err;
200 }
201 }
202
203 // Get the stream pointer from a BlockingStream long field.
204 PaStream *jpa_GetStreamPointer( JNIEnv *env, jobject blockingStream )
205 {
206 jclass cls = (*env)->GetObjectClass(env, blockingStream);
207 return (PaStream *) jpa_GetLongField( env, cls, blockingStream, "nativeStream" );
208 }